H2气氛中TiOx的形成及其对Ni/TiO2催化剂顺酐液相加氢性能的影响

采用等体积浸渍法制备了Ni/TiO₂催化剂，利用N₂物理吸附、H₂-TPR、XRD、H₂-TPD及CO-TPSR等表征手段研究H₂气氛中随着热处理温度升高，Ni/TiO₂催化剂结构和织构变化规律，并考察催化剂的顺酐液相加氢性能。研究表明，随着热处理温度的升高，催化剂C-C键加氢活性逐渐增高，而CO加氢活性先增高后降低。产生这一现象的原因与TiO_x物种随H₂气氛中热处理温度的升高而逐渐增多有关。

Formation of TiOx in hydrogen atmosphere and its effect on catalytic performance of Ni/TiO2 catalyst for liquid phase hydrogenation of maleic anhydride

Ni/TiO₂ catalysts were prepared by impregnation method and were characterized by N₂ physical adsorption,H₂-TPR,XRD,H₂-TPD and CO-TPSR in order to investigate the effect of the rising of reduction temperature on its structure and textural properties.The catalytic performance of Ni/TiO₂ catalysts for liquid phase hydrogenation of maleic anhydride were evaluated.The results showed that the activity of the catalysts for the hydrogenation of C-Cbond increased with the enhancement of reduction temperature while the activity of the catalyst for the hydrogenation of C-O bond increased first and then decreased.The reason for this phenomenon was attributed to the increasing amount of TiO_x species with the raising of reduction temperature in hydrogen atmosphere.